For those longing for just the right balance of plushness and support this Euro top California king mattress is a top choice Five different levels of highdensity foamincluding plush pressurerelieving foam and gel memory foam for temperature regulationwork in concert to provide the ideal balance of comfort and support Rest assured a power packed wrapped steel unit offers reinforced structural support where you need it most while 13gauge wrapped coils provide edge support for a larger sleep surface and supportive sitting surface Foundationbox spring available sold separately